Re: [ServiceWorker] Cancelling HTTP fetch (#592)

In Gecko, we have a loadgroup that knows about network requests. When a document goes away, the loadgroup terminates the relevant requests. So the fetch() will fail with an AbortError when called from documents. I'll let @wanderview comment if the same thing will work on workers now that he implemented loadgroups for them. 

Ben, when a SW is created for handling a document's request, will it (or can we make it) acquire that document's loadgroup?

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